Hi!
To solve this we need to isolate x on one side.
Whatever we do to the equation we do it to both sides.
(x - 8)² = 7
Find the square root of both sides.
√(x - 8)² = √7
x - 8 = √7
Add 8 to both sides.
x - 8 + 8 = √7 + 8
x = √7 + 8
The answer is E. -√7 + 8 and D. √7 + 8
Hope this helps! :)
-Peredhel